I recently purchased an auto burst trigger. Its a mechanical peace that basically works like bump firing. It bolts to the trigger guard and uses the recoil of the gun to fire like an automatic. It comes with a card stating that it is ATF approved. My question is, while it works, my ar15 wont fire all the bullets. The firing pin strikes the primer and the ammo doesn't fire. I have tried different brands of ammo with the same results. I can kick the bullet out reload it and it will fire. Is this because my carrier isn't designed for full auto firing?